This may have come up in an earlier thread, but i have a question for the darker-haired SBG's that have been sly for awhile - Does your MPB shadow eventually ware down over time?
I think you learn to not notice it as much as you do now. Also, as you get more color and refine your routine it won't be as prominent.
The reality is that most of us go gray/white on the sides with age and therefore it becomes less obvious.